Heater rod/Thermocouple replacement

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jetdillo
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Heater rod/Thermocouple replacement

Postby jetdillo » Thu Mar 26, 2020 6:08 am

Is there a document either here or from Raise that details how to replace the heater rod and thermocouple on an N2+ ?
The heater on the left hot-end isn't broken, but the hysteresis as it's approaching temperature is getting larger and can bobble by a couple degrees during printing. I've had some spares laying around for a while now. and am thinking it might be time to just go ahead and get new ones in there before it gets worse. This is original equipment from when I first got the printer in mid-2016.
Thanks!

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Vicky@Raise3D
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Re: Heater rod/Thermocouple replacement

Postby Vicky@Raise3D » Fri Mar 27, 2020 12:24 am

Can you try PID Auto-Tune once and see whether it can work better or not?
https://support.raise3d.com/N2-N2-Plus/ ... 3-784.html

zemlin
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Re: Heater rod/Thermocouple replacement

Postby zemlin » Fri Mar 27, 2020 1:16 pm


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jetdillo
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Re: Heater rod/Thermocouple replacement

Postby jetdillo » Fri Mar 27, 2020 8:15 pm

Vicky@Raise3D wrote:Can you try PID Auto-Tune once and see whether it can work better or not?
https://support.raise3d.com/N2-N2-Plus/ ... 3-784.html


I haven't tried that. I've watching the overshoot when heating go from 2-3 degrees to about 7 or more and the variance while printing get up to about 3 degrees. That seems pretty out of band and like something might be wearing out.

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jetdillo
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Re: Heater rod/Thermocouple replacement

Postby jetdillo » Fri Mar 27, 2020 8:16 pm

zemlin wrote:heater/thermocouple instructions: https://s2.raise3d.com/public/media/201 ... uction.pdf


Cool. Thanks!

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jetdillo
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Re: Heater rod/Thermocouple replacement

Postby jetdillo » Sun Mar 29, 2020 6:22 am

Vicky@Raise3D wrote:Can you try PID Auto-Tune once and see whether it can work better or not?
https://support.raise3d.com/N2-N2-Plus/ ... 3-784.html


I tried the auto PID tuning on the left nozzle and it failed when trying to Auto-Tune to 100C with "Temperature exceeded" on the first loop.

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jetdillo
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Re: Heater rod/Thermocouple replacement

Postby jetdillo » Mon Mar 30, 2020 2:51 am

jetdillo wrote:
Vicky@Raise3D wrote:Can you try PID Auto-Tune once and see whether it can work better or not?
https://support.raise3d.com/N2-N2-Plus/ ... 3-784.html


I tried the auto PID tuning on the left nozzle and it failed when trying to Auto-Tune to 100C with "Temperature exceeded" on the first loop.


I tried this again tonight and it's still failing. Do you think the problem could be with the small controller board that the heaters and fans plug into ?

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Vicky@Raise3D
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Re: Heater rod/Thermocouple replacement

Postby Vicky@Raise3D » Mon Mar 30, 2020 10:36 pm

Please try set the target temperature to be 215C and auto-tune PID. It's possible that the extruder controller board where the fans plug into, it can also also be the ribbon cable.
Please export a serial log and attach here. It may can help us as well.

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jetdillo
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Re: Heater rod/Thermocouple replacement

Postby jetdillo » Fri Apr 03, 2020 11:58 pm

I think I figured it out. There's a short on the cable for one of the 12V hot-end fans. When the cable on the left fan gets tugged or moves, everything on the heater/fan board cuts off, including the LEDS inside the printer chamber. I've re-headed the connector on that fan and everything appears to be working now. The printer has been running all afternoon.
I'll let you know if I run into any more problems.


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